Determination of the lambda value of reformate with the aid...

H - Electricity – 01 – M

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H01M 8/04 (2006.01) H01M 8/06 (2006.01)

Patent

CA 2653636

The invention relates to a method for determining the lambda value (.lambda.ist) of reformate (10) that is supplied to a fuel cell stack (12). In said method, the no-load voltage (Uo) in at least one fuel cell element (14) is detected and evaluated to determine the lambda value (.lambda.ist). According to the invention, the at least one fuel cell element (14) is a terminal fuel cell element of the fuel cell stack (12) that is provided exclusively for measuring purposes, and the voltage provided for at least one consumer (34) can be tapped in the remaining fuel cell elements (36) of the fuel cell stack (12). The invention also relates to a method for controlling the lambda value in a reformer, to a device for determining the lambda value, to a system (32) comprising a reformer (16) for converting at least fuel (20) and air (22) into reformate (10) and to a fuel cell stack (12) that can be supplied with reformate (10) by the reformer (16), the lambda value in said reformer (16) being controlled.

L'invention concerne un procédé permettant de déterminer la valeur lambda (.lambda.ist) d'un reformat (10) prévu pour alimenter un empilement de cellules électrochimiques (12), lequel procédé consiste à déterminer la tension à vide (Uo) d'au moins un élément (14) de la pile à combustible et à évaluer ladite tension pour déterminer la valeur lambda (.lambda.ist). Selon l'invention, ledit au moins un élément (14) de la pile à combustible est un élément terminal de l'empilement de cellules électrochimiques (12), destiné exclusivement à être utilisé à des fins de mesure, et la tension des autres éléments (36) de l'empilement de cellules électrochimiques (12), destinée à au moins un consommateur (34), peut être prélevée. L'invention concerne également un procédé de régulation lambda d'un reformeur, un dispositif permettant de déterminer la valeur lambda ainsi qu'un système (32) comprenant un reformeur (16), destiné à transformer au moins le combustible (20) et l'air (22) en reformat (10), et un empilement de cellules électrochimiques (12) alimenté en reformat (10) par le reformeur (16), une régulation lambda dudit reformeur (16) étant effectuée.

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